Transient 18 F-Fluorodeoxyglucose Activity on PET/CT of Herniation Pit in Thyroid Cancer Patient: A Case Report

Yun Hee Kang; Geon Park

doi:10.3348/jksr.2017.77.4.249

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Kang and Park: Transient 18 F-Fluorodeoxyglucose Activity on PET/CT of Herniation Pit in Thyroid Cancer Patient: A Case Report

Case Report

J Korean Soc Radiol 2017;77(4):249-253.

Published online: 19 January 2017

DOI: https://doi.org/10.3348/jksr.2017.77.4.249

Transient ¹⁸ F-Fluorodeoxyglucose Activity on PET/CT of Herniation Pit in Thyroid Cancer Patient: A Case Report

Yun Hee Kang, MD¹, Geon Park, MD^*,²

¹Department of Nuclear Medicine, Eulji University Hospital, Daejeon, Korea

²Department of Radiology, The Catholic University of Korea, Daejeon St. Mary’s Hospital, Daejeon, Korea

^*Corresponding author: Geon Park, MD Department of Radiology, The Catholic University of Korea, Daejeon St. Mary’s Hospital, 64 Daeheung-ro, Jung-gu, Daejeon 34943, Korea. Tel. 82-42-220-9639 Fax. 82-42-220-9087 E-mail: greempark@gmail.com

Received 3 August 201613 January 2017 Accepted 21 April 2017

This is an Open Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/by-nc/4.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

A herniation pit is a benign bone pit characterized by its femoral location and sur-rounding sclerotic margin. Few reports have been issued on the fluorodeoxyglucose (FDG) positron emission tomography findings of herniation pit. Here, we report the unique case of a thyroid cancer patient, having a herniation pit showing transient FDG uptake, which mimicked bone metastasis.

Keywords: Positron-Emission Tomography, Femur Head, Femur Neck, Fluorodeoxyglucose F18

REFERENCES

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Fig. 1.

Transient ¹⁸ F-FDG activity of herniation pit, in a 53-year-old woman with thyroid cancer. A. PET/CT fusion image shows a focal hypermetabolism in the left anterolateral femoral head. B. CT bone setting finding, which corresponds to the location of the hypermetabolic lesion, shows no definite abnormality. C. After 3 weeks, axial CT of pelvic bone shows a small hypodense lesion without a sclerotic rim, in the left anterolateral femoral head. D. Bone scan shows focal increased uptake in the left lateral femoral head. CT = computed tomography, FDG = fluorodeoxyglucose, PET = positron emission tomography. Transient ¹⁸ F-FDG activity of herniation pit, in a 53-year-old woman with thyroid cancer. E. MR T1-weighted (left), T2-weighted (middle), contrast enhanced T1-weight (right) images. T1 weighted image shows ill defined low SI lesion in the anterosuperior femoral head/neck junction. T2-weighted image shows high SI with adjacent marrow edema. Contrast enhanced T1-weighted image shows focal rim enhancing lesion with mild diffuse enhancement of marrow. F, G. Follow up PET/CT images after 9 months show no FDG uptake (F), and a hypodense lesion with a sclerotic border in the left anterolateral femo-ral head, characteristic of a herniation pit (G). CT = computed tomography, FDG = fluorodeoxyglucose, PET = positron emission tomography, SI = signal intensity

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